I find it necessary to do a lot of my riding in either early morning or late evening with lights. I started out using AA rechargeables and would recharge after each ride. The downside was that on longer rides, say an hour, I would have to switch to a spare light or spare batteries. I've made the switch to a Four Sevens 123 tactical light that can be programmed for two different outputs. At the highest setting, I can get 360 lumens OTF for 1.8 hours of continous use, or greater time by dialing back the output. 123s require a separate charger and the batteries are more expensive but the light is smaller and lighter than my other AA lights. This seems to work for me. I added a second 123 light for my MTB.